Dental engine



(No Misael.)

J. T. CALVERT. DENTAL ENGINE.

Patented Nov. 24, 1891.

TNI

Sift

with the other parts removed. Fig. a

NiTEn STATES PATENT DEN-TAL ENGINE.

SPECIFICATION forming part of Letters Patent No. 463,855, dated November24, 1891.

Application filed June 4, 1891. Serial No. 395,085. (No model.)

To al?, whom, t may concern.; l

Be it known that I, JAMES THOMAS OAL- VERT, a citizen of the UnitedStates,residing at Spartanburg, in the county of Spartanburg, State ofSouth Carolina, have invented certain new and useful Improvements inDental Engines, of which the following is a speciiication, referencebeing had therein to the accompanying drawings.

This invention relates to certain new and useful improvements in dentalengines, and more particularly to pulley-heads therefor.

It has for its objects, among others, to provide a simple and improvedconstruction ivhereby a plurality of cables can be attached and operatedfrom the one head, so that an operator can have a plurality of differentinstruments handy for use and not have to stop the engine and changeinstruments, thus effecting amaterial saving in time. I provide a platecarried by the spindle, and in which the pulley-shaft has a bearing, anda movable plate sleeved upon the stud of the said plate and carrying thepulleys and their accessories. Suitable means are provided for holdingthe desired pulley in operative contact with the pulley-shaft and itsconnections when adjusted thereto.

Other objects and advantages of the invention will hereinafter appear,and the novel features thereof Will be specifically defined by theappended claims.

The invention is clearly illustrated in the accompanying drawings,which, with the letters ot' reference marked thereon, form apart of thisspecification, and in which- Figure l is a view, partly in section andpartly in side elevation, showing my improve.

ments applied to a dental engine, sufficient parts of the engine beingshown for the proper understanding of my invention. Fig. 2 is an endview looking at the plate on the spindle is a cross-section on the line3 3 of Fig. l. Fig. 4t is a cross-section on the line 4 4 of Fig. 1.

Like letters of reference indicate like parts throughout the severalviews in which they occur.

Referring now to the details of thev drawings by letter, A designatesthe upright or standard of an ordinary dental engine and provided with asocket (t for the spindle B of the pulley-head. This spindle is formedwith a shoulder ct', as seen in Fig. 1, and the portion of the spindleabove this shoulder is extended horizontally, as shown at A', to forni abearing for thepulley-shaft B,on the outer end of which is carried thepulley O', of any known or approved form of construction and adapted tobe driven by belt or band O2, driven in the usual manner.

D is a disk or plate securely aflixed to or fast upon the upper part ofthe spindle, and through which the pulley-shaft projects and has'abearing, as shown in Fig. l. Suitable meansmay be provided for oilingthe journal-as, for instance, a hole 0,2, as seen in Fig. l. Thepulley-shaft is provided with a head d3 Within the plate or disk D,asseen in Fig. l, to prevent its accidental Withdrawal, and also withfingers or points l), adapted to engage with a point b to actuate thecable, as hereinafter described. The disk or plate D has a central studd., as shown more clearly in Fig. l, and is provided upon its innerfacewith a plurality of depressions or countersinks e, as shown in Figs. 1and 2, for engaging and receiving the spring-'actuated bolt, hereinafterdescribed.

E is the front plate. It is provided with a central sleeve E, which issleeved upon the stud d of the rear plate, as seen in Fig. l, and thisfront plate is held in position by means of the screw F engaging thethreads of a socket in the stud d of the rear plate, as shown best inFig. l, so that the front plate may be revolved on the stud whendesired. The front plate has a surrounding fiangef, as

seen in Fig. l, to inclose the parts hereinafter described. There aretwo or more cable-carrying devices. As each is substantially the same, Ishall describe only one `and have shown the same in section in Fig. l.

G is the revolving socket, provided With a cap g on the inner endthereof and carrying the point b', hereinbefore referred to, and whichis engaged by the points b on the pulley-shaft.

G is a sleeve secured to the front plate and surrounding and supportingthe socket.

H is the cable attached to the revolving socket and provided with aflexible covering IOO lI of any preferred material and form ofconstruction, and I is a protecting-sleeve screwed onto the sleeve Gr',as seen in Fig. il..

Upon the inner face of the front plate is a boss J, in the bore of whichworks a springaetuated bolt K, with a rounded outer end, and adapted toengage anyone of the depressions or countersinks e in the rear plate, asseen in Fig. l.

The operation will be readily understood..

As shown in Fig. 1, the device is ready for operating the cable, theoperatin g devices of which are shown in position to be operated by therevolution of the pulley-shaft in the usual Way. Supposing the operatordesires to use another tool from the one carried by that cable,ordinarily he would have to stop the machine, remove the tool, and placethe other one in the holder and then proceed. lVith inyimprovement allthat it is necessary to do is to revolve the front plate on its pivotuntil the cap attached to the socket carrying the desired tool comesopposite the pulley-shaft, when the springactuated bolt springs into thedepression in the rear plate and holds the parts in place. Anotherpartial turn will bring another one into operative position. The boltautomatically springs into the depression, and yet, owing to its roundedend, it permits of the turning of the front plate when desired.

Various modifications in detail may be resorted to Without departingfrom the spirit of the invention or sacrificing any of its ad- 5 vantages.

\Vhat I claim as new isl. A pulley-head for dental engines, pro videdwith a plurality of cable-operating de vices, as set forth.

2. A pulley-head for dental engines, having a rotatable portion carryinga plurality of cable-rotatingsookets and means for holding the rotatableportion in its adjusted position, as set forth.

3. The combination, with the standard and the pulley-shaft, of the rearplate, the front plate rotatable thereon, and the plurality ofcable-carrying sockets arranged to be independently actuated from thepulley-shaft, as set forth.

et. The combination, with the standard and the pulley-shaft, ot' t-hefixed rear plate having depressions, the rotatable frontplate having aspring-actuated bolt, and a plurality of independently-operatingcable-rotating devices, all substantially as specified.

5. The combination, with the standard and the rear plate, of thepulley-shaft having a bearing in the said plate and carrying the pointsor fingers, the rotatable front plate having a Hange and a plurality ofcable-rotating devices each provided with a point to engage the pointsof the pulley-shaft, and a spring-actuated retainer for the front plate,as set forth.

In testimony whereof I aiiix my signature in presence of two witnesses.

JAMES THOMAS (.JAI/'El'l Witnesses;

GEO. W. NIcHoLLs, Guo. E. LAnsrL-m.

